All,
RISCV64 support has now been enabled for Ubuntu Budgie
So you can now install ubuntu-budgie-desktop to get UB, budgie and customisation for your RISCV64 based machine.
If you are interested in a mini-project, it would be more than helpful to come-up with a way (step by step guide) to show how to run a RISCV64 based machine with Budgie via - for example QEMU
Some ideas: